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Generate -12V from +12! Help me!!!

Bao Viet
Prodigy 20 points

I want to create a 12V power supply from the +12 power supply of the computer (1Ampe), can anyone help me to find the right type of product?
Sorry for my bad english, thanks for reading it!

  • 0
    Prodigy 5 points

    Hello Bao, thank you for posting to the forum.

    TI has a section called "TI DESIGNS" that showcases reference designs.
    I searched for -12Vout and a list of negative 12V designs was provided.
     
    This one in particular should fit your needs.
    12V input -12V 1.5A output Buck-boost inverter
    http://www.ti.com/tool/PMP4369

    Will this work for you?
    If not, please look at the other designs provided by search.

  • 0 in reply to Ed Walker
    Prodigy 20 points
    Thank you very much. I want to build a power supply, generating + 3.3V voltage (20A), + 5V (20A), -12V (1A) from 12VDC, can you help me choose component to do that?
  • 0 in reply to Bao Viet
    Prodigy 5 points

    Hello Bao, I will show you how to use the Webench tool.

    There are many solutions. To find the right one for you, the tool offers many choices for a design.

     

    Start with TI POWER.

    www.ti.com/.../overview.html

     

    In the middle of the page you will see

     

    Create & design

    Simplify your design process

    and speed time to market

    with easy-to use design tools

    and TI reference designs.

     

    WEBENCH Design Center

    Power Reference Designs

     

    From the Webench Design Center you will find the Webench Designer on the right.

    Click on Multiple loads

     

    Then enter your specifications.

    Vin 11V to 14V
    Vout 5V 20A

    Add Load
    Vin 11 to 14V
    Vout 3.3V 20A

    Then Submit Project Requirements

     

     

    It shows the solution;

     

    View Project Details, upper right corner

     

    Then Create project;

     

     

     

    Attached is the report.

    Here is a link to the public design.

    https://webench.ti.com/wb5/OpenPublicSharedProject.jsp?id=219D554F88B3EC4A&s=c

     

    Give this a try, you can use Webench to create power designs, and other Analog designs as well.

    webench_project_916945_114_462286667.pdf